Start time and instant operation time (trip):
(Im/Iset ratio >1.05)
<70 ms
Reset
Reset ratio
97 % of pick-up setting
Reset time setting
Inaccuracy: Reset time
0.010 … 10.000 s, step 0.005 s
±1.5 % or ±60 ms
Instant reset time and start-up reset
<55 ms
9.2.1.6. Harmonic overcurrent (50H/51H, 68) Ih>
Table. 9.2.1.6. - 267. Harmonic overcurrent (50H/51H, 68) technical data
Input signals
Input magnitudes
Phase current IL1/IL2/IL3 TRMS
Residual current I01 TRMS
Residual current I02 TRMS
Pick-up
Harmonic selection
2nd, 3rd, 4th, 5th, 7th, 9th, 11th, 13th, 15th, 17th or 19th
Used magnitude
Harmonic per unit xIn
Harmonic relative Ih/IL
Pick-up setting
0.05…2.00 x In, setting step 0.01 x In (xIn)
5.00…200.00 %, setting step 0.01 % (Ih/IL)
Inaccuracy
-Starting xIn
-Starting xIh/IL
<0.03 xIn (2nd, 3rd, 5th)
<0.03 xIn tolerance to Ih (2nd, 3rd, 5th)
Operation time
De nite time function operating time setting
0.00…1800.00 s, setting step 0.005 s
Inaccuracy
-De nite Time (Im/Iset ratio >1.05)
±1.0 % or ±35 ms
IDMT operating time setting (ANSI / IEC)
0.02…1800.00 s, setting step 0.001 x parameter
IDMT setting parameters
k Time dial setting for IDMT
A IDMT Constant
B IDMT Constant
C IDMT Constant
0.01…25.00 step 0.01
0…250.0000 step 0.0001
0…5.0000 step 0.0001
0…250.0000 step 0.0001
Inaccuracy
-IDMT operating time
-IDMT minimum operating time; 20 ms
±1.5 % or ±20 ms
±20 ms
Instant operation time
Start time and instant operation time (trip):
(Im/Iset ratio >1.05)
<50 ms
Reset
Reset ratio
95 % of pick-up setting
Reset time setting
Inaccuracy: Reset time
0.010 … 10.000 s, step 0.005 s
±1.0 % or ±35 ms
Instant reset time and start-up reset
<50 ms
Note!
Harmonics generally: Amplitude of harmonic content has to be least 0.02 x In when relative
(Ih/IL) mode is used.
AQ-T257
Instruction manual
Version: 2.00
339
© Arcteq Relays Ltd
